实际流体偏差函数的新关联式(Ⅰ)——等温焓差

NEW CORRELATIONS OF REAL FLUID DEPARTURE FUNCTION(Ⅰ)——ISOTHERMAL ENTHALPY DEPARTURE

本文根据三参数对应状态理论,以Lee—Kesler偏差函数图表为基础,采用正交筛选法对数据进行处理,提出了一组关于T_r,P_r,ω三参数偏差函数计算的新关联式(称作LKQC式)。本文介绍了实际流体等温焓差计算的新关联式,并用18种化合物7组混合物5869个焓差实验值与LKQC,LK,PR,YA,SRK等方法的计算值作了对照检验。结果表明,LKQC关联式在所有方法中最佳。

A set of new correlations(named for LKQC)to estimate the fluid departure function using T_r, P_r, ω are developed by means of Orthogonal Sieving method. Based on the 3-parameter corresponding state principle and Lee-Kesler's tabular data on the departure function, the correlations for estimating isothermal enthalpy departure are presented in this paper. The calculated values have been checked against literature data points of 5896 for 18 compounds and 7 mixtures and compared with the one of EOS (LK,PR, SRK )and YA expression. The results show that the accuracy of the correlation is the best in those of PR, SRK and YA, especially in the liquid region.